I keep my dive computers and camera gear in pelican boxes. If I'm flying I'd rent most everything else so any old bag will do. I also pack a heavy duty mesh backpack which allows gear to drain and makes it easier to lug between dives. Something like this https://www.amazon.com/XS-Scuba-Seaside-Deluxe-Mesh/dp/B01EFFXHKA/ref=sr_1_17?dchild=1&keywords=mesh+backpack+for+scuba+diving&qid=1601409882&sr=8-17